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• Cure for puzzle piece programming habbits?

  - by Recursion

  Even though I went to a decent CS school, I was still taught with the mentality of programming with puzzle pieces. By puzzle pieces I mean, looking up code segments at each step of the development process and adding them together as needed. Eventually gathering all of the pieces and having a properly working program. So as an example, if in my program the next step is to tokenize a string, I go to google and search "how do I tokenize a string in language". All instead of critically thinking about its implementation. I personally don't think its a very good way to program and I always seem to forget everything that I have searched for. So how can I get out of this puzzle piece mode of programmer that I was taught.

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• what means "not enclossing class" hier in scala

  - by echo

  Hoi ,i am learning scala and trying to translate some java code to scala. Here are some of the code below in java that I want to translate public class Note{ protected void addNote(Meeting n) { //add n to a list } } public abstract class Meeting{ public Meeting(String name,Note note){ note.addNote(this) } } when i translate them to scala class Note{ protected[Meeting] addNote(n:Meeting){ //add n to list } } abstract class Meeting(name:String,note:Note){ note.addNote(this) } then i got an error in class Note : Meeting is not a enclossing class. what does it mean? I have tried packagename instead of Meeting,like this:protected[packagename] addNote(n:Meeting) ,but i doesnt work.

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• Hibernate Criteria API: get n random rows

  - by hadrien

  I can't figure out how to fetch n random rows from a criteria instance: Criteria criteria = session.createCriteria(Table.class); criteria.add(Restrictions.eq('fieldVariable', anyValue)); ... Then what? I can't find any doc with Criteria API Does it mean I should use HQL instead? Thanx! EDIT: I get the number of rows by: int max = criteria.setProjecxtion(Projections.rowCount()).uniqueResult(); How do I fetch n random rows with indexes between 0 and max? Thx again!

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• IE or Firefox,which one has a more logical CSS handling ?

  - by Najm

  hello there , i know that there is some rules and standards in css handling but i mean which one is closer to a human thinking. for example : when i give a DIV tag a height property of 100px i just want it to be 100px! but in Firefox i should work on min-height or max-width and so on ! there is many like this examlpe , i think IE read css more humanestic against Firefox. i have several experiences in this case , your final nice design in IE can be a mess in Firefox thats because of the way they handle css. Firefox act as a robot but IE act as a human-half robot ! its just my idea. i will be glad to hear and learn from you proffesionals and other friends here. thank you.

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• How to do REST with PUT and DELETE

  - by Svish

  It says about the type option of the jQuery.ajax() method that The type of request to make ("POST" or "GET"), default is "GET". Note: Other HTTP request methods, such as PUT and DELETE, can also be used here, but they are not supported by all browsers. So... Does that mean that PUT and DELETE won't work if the browser does not support it, or just that PUT and DELETE can not be done natively by the user in the browser? If I can't or shouldn't use those, what do people usually do instead? Send the method as a a GET or POST parameter instead? Or?

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• Is there any declare for toggle() that if its open do this, closed to that?

  - by Dejan.S

  Im doing some jquery stuff with toggle(), I'm doing different actions depending on if the current div is closing or showing, i know i can easy check if a div hasClass() or is(':visible') for what i want to do, but I'm thinking maybe there is somehow that i can reduce the amount of code or just do it more efficient? like declare the toggle() with two functions that this is for when its showing and this is for when its closing, is this possible? hope you get what i mean? like this, or check a jsfiddle $('#click_me').on('click', function() { $('#contain').toogle('blind', 300, function (){ alert('open'); }, function (){ alert('close'); }); });

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• What could cause a returning function to crash? C++

  - by JeanOTF

  So I have been debugging this error for hours now. I writing a program using Ogre3d relevant only because it doesn't load symbols so it doesn't let me stack trace which made finding the location of the crash even harder. So, write before I call a specific function I print out "Starting" then I call the function and immediately after I print "Stopping". Throughout the function I print out letters A-F where F is printed right before the function returns (one line above the last '}') The weird thing is when the crash occurs it is after the 'F' is printed but there is no 'Stopping'. Does this mean that the crash is happening in between somewhere? The only thing I can think of is something going wrong during the deallocation of some of the memory allocated during the function. I've never had anything happen like this, I will keep checking to make sure it's going wrong where I think it is.

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• Radio button how to?

  - by Azzyh

  what i want to do is that when you vote Y or N (two different radio buttons) and then it inserts into the "vote" column(in database) = Y or N(what you pickd), if nothing then echo error. I know how to do this like halfway, i never worked with radiobuttons before so i need you guys. Here's a two radio button right: Yes: <input type="radio" value="Y" id="voteYes" name="vote"></input> <br> No: <input type="radio" value="N" id="voteNo" name="vote"> </input> I gave the value N and Y, not the same ID, but the same name. I think its right, but how should i do with the PHP part of what i want to do? I mean shall i call for "vote"? ($_GET["vote"]) i dont think so.. here's where im stuck

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• Scalling connected lines

  - by Hristo

  Hello, I have some kind of a shape consisting of vertical, horizontal and diagonal lines. I have starting X,Y and ending X,Y (this is my input - just 2 points defining a line) of each line and I would like to make the whole shape scalable (just by changing the value of a scale ratio variable), so that I can still preserve the proper connection of the lines and the proportions as well. Just for getting a better idea of what I mean: it'd be as if I had the same lines in a vector editor. Would that be possible with an algorithm, and could you please, give me another possible solution if there is no such algorithm ? Thank you very much in advance!

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• Post wall message on facebook account

  - by Zeroshade

  Hello, I am trying to implement some functionality in a blackberry app, that I saw in other application. Basically it's a window that has a message, and a Facebook icon. When you click on the icon it launches a new window, this window asks the user for permissions(user and password), and then the message is posted in the user's wall. So my question is how can I replicate that?. I have been looking at the graph api, but I just can't figure out how to do all of this in one step. I mean just typing the url in the browser, and some post data. Thanks a lot.

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• How to understand the functional programming code for converting IP string to a number?

  - by zfz

  In a python discusion, I saw a way to convert IP string to a integer in functional progamming way. Here is the Link . The function is implemented in a single line. def ipnumber(ip): return reduce(lambda sum, chunk: sum <<8 | chunk, map(int, ip.split("."))) However, I have few ideas of funcional programming. Could anybody explain the function in detail? I've some knowledg of "map" and "reduce". But I don't konw what "|" and "chunk" mean here? Thanks.

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• About curse of dimensionality

  - by Dan

  My question is about this topic I've been reading about a bit. Basically my understanding is that in higher dimensions all points end up being very close to each other. The doubt I have is whether this means that calculating distances the usual way (euclidean for instance) is valid or not. If it were still valid, this would mean that when comparing vectors in high dimensions, the two most similar wouldn't differ much from a third one even when this third one could be completely unrelated. Is this correct? Then in this case, how would you be able to tell whether you have a match or not?

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• About first-,second- and third-class value

  - by forest58

  First-class value can be passed as an argument returned from a subroutine assigned into a variable. Second-class value just can be passed as an argument. Third-class value even can't be passed as an argument. Why should these things defined like that? As I understand, "can be passed as an argument" means it can be pushed into the runtime stack;"can be assigned into a variable" means it can be moved into a different location of the memory; "can be returned from a subroutine" almost has the same meaning of "can be assigned into a variable" since the returned value always be put into a known address, so first class value is totally "movable" or "dynamic",second class value is half "movable" , and third class value is just "static", such as labels in C/C++ which just can be addressed by goto statement, and you can't do nothing with that address except "goto" .Does My understanding make any sense? or what do these three kinds of values mean exactly?

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• FFT in MATLAB: wrong 0Hz frequency

  - by roujhan

  Hello I want to use fft in MATLAB to analize some exprimental data saved as an excell file. my code: A=xlsread('Book.xls'); G=A'; x=G(2, : ); N=length(x); F=[-N/2:N/2-1]/N; X = abs(fft(x-mean(x),N)) X = fftshift(X); plot(F,X) But it plots a graph with a large 0Hz wrong component, my true frequency is about 395Hz and it is not shown in the plotted graph. Please tell me what is wrong. Any help would be appreciated.

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• Can someone explain Kohana 3's routing system?

  - by alex

  In bootstrap.php, where you set routes, I'm having a hard time getting them to work. I read some documentation a while ago that I can't seem to find again that explains them. Here is one of my examples Route::set('products', 'products/(type)', array('type' => '.+')) ->defaults(array( 'controller' => 'articles', 'action' => 'view_product', 'page' => 'shock-absorbers', )); I thought that would mean a request like products/something would load up the articles controller, and the action_view_product method. But I can't get it to work. Can someone please explain to me exactly how they work, and what all the method parameters are?

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• ruby convert hundredth seconds to timestamp optimization

  - by Nik

  Hey! I want to convert "123456" to "00:20:34.56" where the two digits to the right of the decimal point is in hundredth of a second. So 00:00:00.99 + 00:00:00.01 = 00:00:01.00 What I have: def to_hmsc(cent) h = (cent/360000).floor cent -= h*360000 m = (cent/6000).floor cent -= m*6000 s = (cent/100).floor cent -= s*100 "#{h}:#{m}:#{s}.#{s}" end does this: to_hmsc("123456") #= "0:20:34.56" Question 1: I mean,this is ruby, I find the part ' cent -=... ' rather clunky. Can you see any way to shorten the entire process? Question 2: This has been asked a million times before, but please share whatever you've got: what's the shortest way to add leading zero to the digits. so that to_hmsc("123456") #= "00:20:34.56" Thanks!

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• Retrieving data from simplexml_load_file

  - by Kole Odd

  Working with the simplexml_load_file() function, I get a side effect. To understand what I mean, see this code: $result = simplexml_load_file($xml_link); $arr = array(); foreach ($result->element as $elem) { $arr[] = $elem->number[0]; } print_r($arr); Output: Array ( [0] => SimpleXMLElement Object ( [0] => 330411879136 ) [1] => SimpleXMLElement Object ( [0] => 370346266228 ) [2] => SimpleXMLElement Object ( [0] => 370346266223 ) ) How would I store data into the array so that output would look like so: Array ( [0] => 330411879136 [1] => 370346266228 [2] => 370346266223 )

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• variable=@value@ in Makefiles

  - by user1447110

  I understand that @ suppresses printing of a command in a Makefile... http://www.gnu.org/software/make/manual/make.html#Echoing ... and I understand that $@ is the target name... http://www.gnu.org/software/make/manual/make.html#Automatic-Variables ... but I can't find any information on what a line like this might mean: variable=@value@ I'm not trying to fix anything here, just trying to better understand Makefiles. Update: The "Makefile Subsitutions" section of the GNU autoconf manual explains that it's a value that is substituted by autoconf.

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• Highly efficient filesystem APIs for certain kinds of operations

  - by romkyns

  I occasionally find myself needing certain filesystem APIs which could be implemented very efficiently if supported by the filesystem, but I've never heard of them. For example: Truncate file from the beginning, on an allocation unit boundary Split file into two on an allocation unit boundary Insert or remove a chunk from the middle of the file, again, on an allocation unit boundary The only way that I know of to do things like these is to rewrite the data into a new file. This has the benefit that the allocation unit is no longer relevant, but is extremely slow in comparison to some low-level filesystem magic. I understand that the alignment requirements mean that the methods aren't always applicable, but I think they can still be useful. For example, a file archiver may be able to trim down the archive very efficiently after the user deletes a file from the archive, even if that leaves a small amount of garbage either side for alignment reasons. Is it really the case that such APIs don't exist, or am I simply not aware of them? I am mostly interested in NTFS, but hearing about other filesystems will be interesting too.

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• How messages flows between computers connected with Internet or LAN ?

  - by Praveen

  Hi All, I have been doing Windows programming in .Net since last two years. Now I am shifting to web programming so I just stuck in understanding the fundamentals of web programming, after googling I came to StackOverflow to learn from all of you great guys. My confusion is about how messages flow between systems in distributed enviornment ? I mean suppose I want to send a message "Hello" to a system connected to LAN or Internet, then what will be the steps taken to send the message. Second thing is suppose my system is "A" and I wana send message to system "B" which is connected via a wire, so how the message flows on wire and how system "B" reads it from the wire ? Please someone explain me in a layman terms. Thank you all in advance.

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• Python to C# Conversion of RGBA values not working

  - by clangers

  I'm currently converting some python code to C#, and I'm having an issue with the RGBA C# libraries # Original Python Code: d = math.sqrt( (x - size/2.0)**2 + (y - size/2.0)**2 ) rgbVal = int(200*d/md + 50) rgba = (0,0,0, 255 - rgbVal) img.putpixel((x,y), rgba) // My C# Code double d = Math.Sqrt(Math.Pow((x - DotSize / 2.0), 2) + Math.Pow((y - DotSize / 2.0), 2)); int rgbVal = (int) (200 * d / md + 50); Color color = Color.FromArgb(255 - rgbVal, 0, 0, 0); // ** ERROR ** img.SetPixel(x,y, color); At both instances of the code d is equal to 106 and md is equal to 53. However the resulting rgbVal value is 450. This would obviously mean that 255 - 450 is -195, which causes an error to be thrown as each individual value must be between 0 and 255. Anyone have any idea how I can fix this. Please note that the data is the same when running both the python and C# versions.

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• Count double palindromes in given int sequence

  - by jakubmal

  For a given int sequence check number of double palindromes, where by double palindrome we mean sequence of two same palindromes without break between them. So for example: in 1 0 1 1 0 1 we have 1 0 1 as a palindrome which appears 2 times without a break, in 1 0 1 5 1 0 1 we have 1 0 1 but it's separated (apart from the other palindromes in these sequences) Problem example test data is: 3 12 0 1 1 0 0 1 1 0 0 1 1 0 12 1 0 1 0 1 0 1 0 1 0 1 0 6 3 3 3 3 3 3 with answers 8 0 9 Manacher is obvious for the begging, but I'm not sure what to do next. Any ideas appreciated. Complexity should be below n^2 I guess. EDIT: int is here treated as single element of alphabet

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• In which document do file specifications belong?

  - by Andrew

  In which document would a file specification belong? Perhaps this file is used as an input to a third-party system. Would it belong in its own document? Or would it be better to put it in the functional or design spec? Or somewhere else? When I say file specification, I mean a description of what format the file is (CSV, fixed width, etc), columns, data types, etc. Also, where should you document how the file is generated? i.e. business rules/algorithms which are used to generate the file.

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• How can I find out how much memory an object of a C++ class consumes?

  - by Shadow

  Hi, I am developing a Graph-class, based on boost-graph-library. A Graph-object contains a boost-graph, so to say an adjacency_list, and a map. When monitoring the total memory usage of my program, it consumes quite a lot (checked with pmap). Now, I would like to know, how much of the memory is exactly consumed by a filled object of this Graph-class? With filled I mean when the adjacency_list is full of vertices and edges. I found out, that using sizeof() doesn't bring me far. Using valgrind is also not an alternative as there is quite some memory allocation done previously and this makes the usage of valgrind impractical for this purpose. I'm also not interested in what other parts of the program cost in memory, I want to focus on one single object. Thank you.

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• How do I run Eclipse using Oracle's new 1.7 JDK for the Mac?

  - by sanity

  I'm trying to get the new 1.7 JDK working with Eclipse (this is Oracle's official release). I don't mean just pointing Eclipse to it so you can use it in projects, this works fine, but actually making Eclipse run using the 1.7 JVM. I've moved the new JVM to the top of the list in Java Preferences, but Eclipse still starts with 1.6. If I disable 1.6 in Java Preferences I get a dialog immediately after I double-click on Eclipse saying "Failed to create the Java Virtual Machine". edit: I added the following to my eclipse.ini just before the -vmargs: -vm /Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home/bin/java Yet in the Eclipse installation details dialog I still see: java.runtime.version=1.6.0_31-b04-415-11M3646 edit 2: here are the contents of my eclipse.ini file: https://gist.github.com/2512578

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